bnx2x: prevent masked MCP parities from appearing

During flows which mask block attentions (e.g., register dump) all parities
are masked. However, unlike other blocks the MCP's attention is not masked
inside the block but rather the indication to the driver. If another attention
(e.g., link change) will occour while there's an MCP parity, the driver will
ignore the fact that the parity is masked and erroneously report a parity.

This patch forces the driver to read the MCP masking while checking for
parities.

Signed-off-by: Yuval Mintz <yuvalmin@broadcom.com>
Signed-off-by: Ariel Elior <ariele@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
index f403c6be51deafd25e334b0dd28ddb4d624edb8f..82b658d8c04c47c52931b5138375cd38f0ca519a 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
@@ -4703,6 +4703,14 @@ bool bnx2x_chk_parity_attn(struct bnx2x *bp, bool *global, bool print)
        attn.sig[3] = REG_RD(bp,
                MISC_REG_AEU_AFTER_INVERT_4_FUNC_0 +
                             port*4);
+       /* Since MCP attentions can't be disabled inside the block, we need to
+        * read AEU registers to see whether they're currently disabled
+        */
+       attn.sig[3] &= ((REG_RD(bp,
+                               !port ? MISC_REG_AEU_ENABLE4_FUNC_0_OUT_0
+                                     : MISC_REG_AEU_ENABLE4_FUNC_1_OUT_0) &
+                        MISC_AEU_ENABLE_MCP_PRTY_BITS) |
+                       ~MISC_AEU_ENABLE_MCP_PRTY_BITS);
 
        if (!CHIP_IS_E1x(bp))
                attn.sig[4] = REG_RD(bp,